Interface  Description 

ProbabilityMassFunction<X> 
A probability mass function (pmf) is a function that gives the probability that a discrete random
variable is exactly equal to some value.

Class  Description 

ProbabilityMassFunction.Mass<X> 
Stores a possible outcome for a probability distribution and its associated probability.

ProbabilityMassQuantile<X> 
As probability mass function is discrete, there are gaps between values in the domain of its cdf,
The quantile function is:
\[
Q(p)\,=\,\inf\left\{ x\in R : p \le F(x) \right\}
\]

ProbabilityMassSampler<X> 
A random sampler that is constructed adhoc from a list of values and their probabilities.

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